Your Google-Fu is stronger than mine.
Getting a company to fit replacement type-approved equipment to a car is probably better than trying to hack something that is not type-approved with a Raspberry that could result in an MOT failure.
The UK and Europe's "road vehicles (construction and use)" regulations are there to ensure everything is safe to use while driving and fails safe.
Microprocessor, Raspberry Pi & Arduino Hacker
Mainframe database troubleshooter
2012-18: 1B*5, 2B*2, B+, A+, Z, ZW, 3Bs*3, 3B+
Any DMs sent on Twitter will be answered next month.